feat(annotations): draw on the world by hand (#547)

Supersedes #235 by @cora-fresh-labs, ported onto the current component layout with fixes from review.

Verified before merge: format, package boundaries, unit suite, build, and the browser tracking suite; a browser harness for the change where one applies; adversarial review applied.

Future work (not in this PR): hand-drawn marks do not persist across a reload today, and neither do spoken annotations; there is no storage layer for marks. The natural home is Scenes: a drawing that belongs to a shot and persists per shot, so a scene animation can carry its own marks. Needs an owner.
Co-authored-by: Clint Borle <[email protected]>

src/layers/firms/selection.js

@@ -3,6 +3,7 @@ import {
   fireDetectionKey,
 } from '../../data/firmsLabels.js';
 import * as Cesium from 'cesium';
+import { isPointerFree } from '../../data/inputOwnership.js';
 import { CONTEXT_TOP_N } from './policy.js';
 
 export function createSelection({
@@ -35,6 +36,8 @@ export function createSelection({
       layerState._viewer,
     );
     layerState._clickHandler.setInputAction((click) => {
+      // A tool owns the pointer (src/data/inputOwnership.js): yield the click.
+      if (!isPointerFree()) return;
       const picked = layerState._viewer.scene.pick(click.position);
       const fire = pickedFire(picked);
       if (fire) {